Meaning of “sinus” in the English Dictionary

"sinus" in British English

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uk /ˈsaɪ.nəs/ us /ˈsaɪ.nəs/

sinus noun (SPACE IN BODY)

[ C ] any of the spaces inside the head that are connected to the back of the nose

[ C ] specialized medical a space or passage filled with pus (= a thick yellow liquid) that flows to the surface of the skin

sinus noun (HEART)

[ U ] specialized medical the sinoatrial node (= tissue in the heart responsible for the heart's rhythm):

The electrocardiogram will confirm sinus bradycardia.

(Definition of “sinus” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sinus" in American English

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sinusnoun [ C ]

us /ˈsɑɪ·nəs/

any of the hollow spaces in the bones of the head that open into the nose

(Definition of “sinus” from the Cambridge Academic Content Dictionary © Cambridge University Press)